Mixer for carburetor outlets



Patented Sept. 23, 19234.

UNETED STATES CHARLES N. SILVER, OF MILWAUKEE, WISCONSIN.

MIXER FOE CAR'BUR-ETOR OUTLETS.

hpplication filed July 21, 1919. Serial No. 312,124.

T 0 all whom it may concern:

Be it known that 1, CHARLES N. SILVER, a citizen of the United States,residing at Milwaukee, county of Milwaukee, and State of lVisconsin,have invented new and useful Improvements in Mixers for CarburetorOutlets, of which the following is a. specificat ion. 1

My invention relates to improvements in auxiliary mixers for internalcombustion engine carburetors.

The object of my invention is to provide a mixer in the form of a unitwhich can be independently manufactured at small cost, and readilyinserted between the carburetor outlet and the manifold. A furtherobjectof my invention is to provide a mixing unit which can be adjusted inposition for use by a comparatively inexperienced person,

and at small cost, and which will operate with a high degree ofefficiency.

In the drawingss Figure 1 is a fragmentary view, partly in verticalsection, of a carburetor, and the outlet duct which connects it with themanifold, my invention being illustrated in section and in position foruse.

Figure 2 is a view of my mixing unit detached and shown partly insection, and partly in plan.

Figure 3 is a rear view of the same.

Figure 4: is a front view of the blank from which the fan wings areformed, showing the same as it is cut p-repatory to binding the wings tothe desired contour.

Figure 5 is an end view of the same, indicating one wing in the positionwhich it will occupy when properly contoured.

Lilie parts are identified by the same reference characters thruout theseveral views.

1 is the casing of a carburetor, which may be of any ordinaryconstruction. 2 is an outlet duct, this being elbowed and provided withan ordinary throttle valve having a valve actuating lever 3. In theordinary carburetor for internal combustion engines the outlet duct isthus elbowed and provided with a throttle valve, the rear end or outletend of the elbow being connected with another section 1, which leads tothe manifold,

and may be formed integrally with the latter.

My improved fitting is so constructed that it can readily be insertedbetween the members 2 and 4, both of which are ordinarily provided withcoupling heads 5,

which, instead of being directly connected,

as in ordinary practice, are separated sufficiently to allow the casingmember 6 of my fitting or mixer unit to be inserted between the couplingheads 5. The casing 6 has corresponding heads 7, adapted to be clampedbetween the heads 5, as best illustrated in Figure 2.

My improved fitting is provided with a cylindrical passage 8, and at theout-er end of the casing 6 is notched to receive a cross bar 9 havingdowel pins 10, which pass thru the bars, and are suitably socketed inthe casing 6 at the bases of the notches. The cross bar preferablyprojects slightly beyond the casing'at the top and bottom, as indicatedat 11, whereby when the coupling bolts 12 are removed and the casing '6withdrawn, this cross bar 9 may be easily removed to permit the removalof the blade, as hereinafter explained.

At the rear end of the casing 6 an integrally formed cross bar 1 1 spansthe passage 8, and preferably projects rearwardly into the section 4.The central portion of this bar is enlarged and bored to receive anadjusting screw 16 which has threaded bearings in the bar or cross head14, and which is secured in the desired position of adjustment by a nut17. A. set of mixer paddles 20, preferably formed from a piece of sheetmetal cut and slitted as indicated in Figure 1, and having a circularcentral portion 21 provided with an aperture 22, is clamped to asuitable hub 23 by a nut 24 threaded upon a projecting stem 25, whichpasses thru the aperture 22 of the sheet metal member, and supports themixing paddles20. The end of the stem 25 is taperedas shown at 27, andloosely fitted to a tapered socket 28 in the cross bar 9 when the partsare assembled in position for use.

The rear end of the hub 23 is provided with a socket to receive. theunthreaded end 30 of the adjustable stem 16, and a ball 31 mounted atthe base of the socket in the hub provides a bearing for the end 80 ofthe stem.

\Vith the construction above described, it will be obvious that byremoving the mixing unit from between the members 2 and at of theconnecting duct leading from the carburetor to the manifold, the bar 9may be withdrawn from the notches in the casing 6, after which the stem25, the mixing paddles and the hub 23 may be withdrawn from theadjustable stem 30. Then by removing the nut 24 the paddles may beremoved from thehub, and by loosening the nut 17, the adjusting screw 16may be readily removed or readjusted. It will, of course, be understoodthat the parts are assembled in revers order.

In operation this device works quite similarly to any ordinary rotarymixer driven by the pressure of the air and hydrocarbon on its way fromthe carburetor to the manifold. The particles of atomized hydrocarbons'trike'the blades of the mixer, and assist in driving the latter bymomentum energy. But the impacts of the particles of hydrocarbon on theblades break up the particles, and cause the atomized fragments to befurther distributed in the air; also the heat of the engine transmittedthru the walls of the connecting duct to the mixing blades is utilizedto raise the temperature of the hydrocarbon, and tosome extent tovaporize it at a point where vaporization has no tendency to reduce thequantity of hydrocarbon as is the case where the hydrocarbon is heatedbefore being delivered to the carburetor.

Further, inasmuch as the mixer blades are rotated by the air and thehydrocarbon in a plane transverse to the direction taken by the mixer,the blades perform the function of bailies to a considerable extentwithout checking the movement of the air to the same extent as would bethe case with stationary bafiles.

From the foregoing description it will be seen that I have devised anexceedingly simple and vefiicient mixer which can be readily insertedbetween sections of a carburetor outlet duct, and in which clearance forthe adjusting screw is secured by making the cross head l t in the formof a bow which projects rearwardly into the duct 4:, and that I am thusenabled to manufacture the entire unit as such, and sell it separatelyto be attached by any user. It will be observed thatthe apertures 32which receive the connecting bolts or coupling bolts 12 are slightlyelongated laterally, whereby the same unit may be coupled to heads inwhich the connecting bolts are somewhat differently positioned orspaced.

It Will be understood from the foregoing description that the adjustingscrew 16 con stitutes a bearing pin, about the axis of which the hub andmixing paddles rotate, the reduced front end of the hub constitutingaspindle which has a loose bearing in the removable cross bar socket, butwithoutappreciable frictional resistance, the thrust '31 interposed.

being exerted rearwardly against the hearing pin or adjusting screw 16,with the ball Therefore, the device 01)- erates with minimum frictionalresistance since the ball bears upon the end of the adjusting screw insubstantial point bearing contact therewith, and any conditions whichtend to increase the frictional resistance of the ball upon the pin willcause the ball to rotate in the socket and ieadjustitself to present newor unworn surfaces for contact with the pin.

I claim 1. In an auxiliary fuel mixer for an internal combustion enginehaving a carburetor and intake manifold, the combination with anapertured fitting adapted to be secured between the carburetor outletduct and intake manifold to constitute a continuation thereof, saidfitting bein provided at one end with diametricalI opposed, radiallycxtending slots; of a cross bar integrally connected with the fitting atthe other end thereof, said cross bar spanning the aperture andextending transversely thereof; a second cross bar extending across theaperture and seated in said slots, said second cross bar being providedwith a conical. hole concentric with the aperture; a laterally extendingpin on the second cross bar adapted to engage the fitting and retain thecross bar in position; a rotary fan member having at one end anadjustable bearing connection with the first mentioned cross bar; and aconical bearing member on the other end of said rotary fan memberextending into the conical hole in the second cross bar.

2. In an auxiliary fuel mixer for an internal combustion engine, thecombination with an apertured fitting having at one end a bearingspindle and at the other end a bearing socket, of a rotary fan member,said member comprising a shouldered and apertured hub adapted to receivethe spindle, and having a bearing stem adapted to extend into thesocket, a removable fan member having a centrally disposed apertureadapted to receive the bearing stem, and a nut adapted to threadablyengage the stem to clamp the fan to the shoulder on said hub.

In testimony whereof I affix my signature in the presence of twowitnesses.

CHARLES N. SILVER Vitnesses Lnvnnn'r'r C. Vin-smirk. CHAS. E. SILVER.

